Connected: An Internet Encyclopedia
RFC 1072 - 3.1 SACK-Permitted Option

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### 3.1 SACK-Permitted Option

This two-byte option may be sent in a SYN by a TCP that has been extended to receive (and presumably process) the SACK option once the connection has opened.

          TCP Sack-Permitted Option:

          Kind: 4

                 +---------+---------+
                 | Kind=4  | Length=2|
                 +---------+---------+

Next: 3.2 SACK Option

Connected: An Internet Encyclopedia
RFC 1072 - 3.1 SACK-Permitted Option